Pressure-indicator for roller-mills



(No Model.) l E. STRONG.

PRESSURE INDICATOR FOR ROLLER MILLS. No. 311,927. Patented Feb. 10,1885.

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ELI STRONG, OF KALAMAZOO, MICHIGAN.

PRESSURE'lNDlCATOR FOR ROLLER-MILLS.

SPECIFICATION forming part of Letters Patent No. 311,927, dated February 10, 1885.

Application filed February 2!), IBM. (X0 modi l.)

To all whom it may concern:

Be it known that 1, ELI STRONG, a citizen of the United States, residing at Kalamazoo, in the county of Kalamazoo, State of Michigan, have invented a new and useful Pressure- Indicator for Roller-Mills, of which the fol lowing is a specification.

The object of this invention is to provide roller-mills with simple means to indicate when the grinding-rolls are properly adjusted, also to indicate when the pressure-spring used in connection with the adjustable roll in such mills is properly tensioned.

A construction illustrating the invention consists in an indicator-plate and a clamp op erated by the movement of the adjustable rolls bearing-support in a manner to rigidly clamp the indicator-plate when the rolls are properly adjusted, and to set the plate free when the rolls are adversely adjusted.

In the drawings formingapart of this specification, Figure l is an elevation of a part of a roller-mill, a portion being broken away; Fig. 2, an enlarged View showing the manner of applying the indicator-plate; and Fig. 3 is a plan of an indicator-plate.

The mill shown in Fig. 1 is constructed with two sets of grinding-rolls, R R, having like bearings and adjusting means at each end of the rolls.

In the further description of the mill, in connection with the invention, only the left-hand half of Fig. 1 will be considered further than that a pressure-indicator is to be used with each set of grinding-rolls, one at each end of the rolls, or otherwise as desired. The stationary roll It is located in a bearing-block having a Vertical adjustment, for a purpose which need not be herein considered. The ad- 40 justable rollRis locatedina movable bearingprovided at one end with a hand-wheel, F, and at the other end with an internally-threaded, thimble, O. This thimble is screwed onto the threaded end of rod a, and is adj ustalole thereon. When turning the hand-wheel F in adirection to carry the adjustable roll and movable bearingblock nearer the stationary roll, the thimble screws farther on the rod a, and when turning said wheel to carry the rolls farther apart, the thimble screws farther off the said rod. A tension-spring, r, is mounted on rod i, one end resting against the block E, and the other end resting against the tensionnuts 0, which nuts are adapted to turn on the rod t in fixing the tension of the spring. A collar, 04, is rigidly secured to the rod t, and forms, in connection with the extension S, a clamp, in which theind'icator-plate c is placed.

Should the miller find by placing his hand on the indicator-plate that it was held rigidly by the clamp, he-would know that the rolls were properly adjusted; but should he find the plate free to move,he would know that therolls were running too close together. This would indicate to the miller that the tension on the pressure-spring was too great, or that the grain was not feeding sufficiently fast, and in either case that the rolls were too close together, hence not properly reducing the grain, or failing to grind at all.

In the drawings an indicator-plate is shown perforated centrally, and loosely mounted on the rod tin the clamp. Notches are formed around the edge, in which the miller may catch his finger in ascertaining whether the plate is clamped rigidly or is free to move.

Having thus described myinvention, what I claim. is

1. The combination, with grinding-rolls,one of them adjustable, and means for keeping said adjustable roll in operative position by a yielding pressure, of an indicator-plate and a clamp adapted to hold the plate rigidly or set it free, whereby the condition of the grinding-rolls adjustment may be ascertained, substantially as set forth.

2. A roller-mill provided with a clamp which is operated by the movement of the adjustable rolls bearing and an indicatorplate in said olamp,whereby the plate is rigidly held or set free by the clamp to'indicate the condition of the rolls adjustment, substantially as set forth.

3. The combination, with stationary and adjustable rolls, movable roll-bearings, pressuresprings, and means for adjusting the springs and rolls, of an indicator-plate and a clamp erated by the movementof theadjustable rolls adapted to rigidly clamp the plate or set it free, bearing, and a centrally-perforated indicatorsubstantially as set forth. plate having a notched edge and loosely 1 4. The'coinbination of an adjustable and stamounted in the clamp, substantially as and for tionary roll, a movable bearing for the adjust- 'the object set forth.

able roll,provided with the upward extension, I In testimony whereof I have hereunto suban adjusting-rod provided with the rigid colscribed my name in the presence of two witlar, pressure-spring, and an indicator-plate nesses. centrallyperforated and loosely mounted on the adjusting rod between said extension and rigid collar, substantially as set forth.

5. A roller-mill provided with a clamp opl v ELI STRONG.

\Vitness'es:

T. F. GIDDINGS, GEO. P. HOPKINS. 

